Macquarie Arc and the Lachlan Orocline hypothesis: Magnetic analysis and development of geologically constrained forward model of lithospheric magnetisation

Michael G. Tetley; R. Dietmar Müller; Phillip W. Schmidt; Simon E. Williams

doi:10.1071/ASEG2013ab102

ISSN: 2202-0586
E-ISSN:

oa Macquarie Arc and the Lachlan Orocline hypothesis: Magnetic analysis and development of geologically constrained forward model of lithospheric magnetisation
Authors Michael G. Tetley^a, R. Dietmar Müller^b, Phillip W. Schmidt^c and Simon E. Williams^d
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^a School of GeosciencesUniversity of Sydney, NSW, , Australia, [email protected] ^b School of GeosciencesUniversity of Sydney, NSW, , Australia, [email protected] ^c CSIRO Earth Science and Resource Engineering, NSW, , Australia, [email protected] ^d School of GeosciencesUniversity of Sydney, NSW, , Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2013, Issue ASEG2013 - 23rd Geophysical Conference, Dec 2013, p. 1 - 3
DOI: https://doi.org/10.1071/ASEG2013ab102
- Published online: 01 Dec 2013

Abstract

A comprehensive magnetic analysis of the Lachlan Orocline and Macquarie Arc, both located in the Lachlan Orogen, eastern Australia has been undertaken to test the potential relative rotation of this block to the surrounding units. These results are compared with palaeomagnetic data from the region and a series of geologically constrained crustal-scale forward models of lithospheric magnetisation for the area, with focus on the large-scale structural components of the Lachlan Orocline.

The forward model method treats each geological unit present in both the Macquarie Arc itself and the surrounding areas as independent parameterised stratigraphic units. Using a Geographical Information System (GIS) approach, known geological, structural and physical properties are used to produce a series of vertically integrated value grids. These grids are then used as input to model the regional magnetisation in the global scale magnetic field forward model.

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References

Burton, G.R., 2010. New structural model to explain geophysical features in northwestern New South Wales: implications for the tectonic framework of the Tasmanides. Australian Journal of Earth Sciences, 57(1), pp.23-49.
Butler, R.F., 1991. Paleomagnetism: Magnetic Domains to Geologic Terranes, Blackwell Science.
Coney, P.J. et al., 1990. The regional tectonics of the Tasman orogenic system , eastern Australia. Journal of Structural Geology, 12(5), pp.519-543.
Glen, R., Quinn, C. & Xiao, W., 2011. Island Arcs: Their role in growth of accretionary orogens and mineral endowment. Gondwana Research, 19(3), pp.567-570.
Glen, R.A., 2005. The Tasmanides of eastern Australia. Geological Society, London, Special Publications, 246(1), pp.23-96.
Gray, D.R. & Foster, D.A., 2004. Tectonic evolution of the Lachlan Orogen, southeast Australia: historical review, data synthesis and modern perspectives. Australian Journal of Earth Sciences, 51(6), pp.773-817.
Hemant, K. & Maus, S., 2005. Geological modeling of the new CHAMP magnetic anomaly maps using a geographical information system technique. Journal of Geophysical Research, 110(B12), p.B12103.
Kemp, a. I.S. et al., 2009. Isotopic evidence for rapid continental growth in an extensional accretionary orogen: The Tasmanides, eastern Australia. Earth and Planetary Science Letters, 284(3-4), pp.455-466.
Masterton, S.M., Gubbins, D. & Hemant, K., Forward modelling of oceanic lithospheric magnetisation. , pp.1-24.
Milligan, P.R. & Franklin, R., 2004. A new generation Magnetic Anomaly Grid Database of Australia (MAGDA). Preview, (December), pp.25-29.
Musgrave, R.J. & Cayley, R., 2011. Unfolding an Orocline Restores Australian Siluro-Devonian Poles to the Gondwana APWP. AGU Fall Meeting Abstracts, -1, p.0991.
Scheibner, E. & Veevers, J.J., 2000. Tasman Fold Belt System. In J. J. Veevers, ed. Billion-year earth history of Australia and neighbours in Gondwanaland. Gemoc Press, pp. 154-234.

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Article Type: Research Article

Keyword(s): Lachlan; magnetic modelling; rock and mineral magnetism; Tasmanides; tectonics

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